Wrench for veneer-press screws.



0. BERGSTROIV. WRENCH FOR VENEER PRESS SCREWS. APPLICATION FILED JUNI:I8, |914.

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OSCAR BERGrSTROM, OF CHICAGO, ILLINOIS,` ASSIGNOR TO HANDY MANUFACTURINGCOMPANY, OF CHICAGO, ILLINOIS.

WRENCH FOR VENEERPRESS SCREWS.

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Speccation of Letters Patent.

Patented .italy c, mia.

Original application filed November 10, 1913, Serial No. 800,167.`Divided and this application filed June 18,

1914. Serial No. 845,823. v

To all whom it may concern Be it known that I, OSCAR BERGsTRoM, citizenof the United States, residing at Chicago, in the county of Cook andState of Illinois, have invented certain new and useful Improvements inWrenches for Veneer- Press Screws; and do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill en able others skilled in the art to which it ap pertains to makeand use the same.

My invention relates to ratchet wrenches and more particularly towrenches adapted for use with the screws carrying the pressure-feet ofveneer presses.

The prime object of my invention is to provide a ratchet Wrench whichmay be easily and quickly applied to, or detached from the member to berotated thereby; which will consist of few and easily assembled parts;which will be equipped with suitable stop means for preventing anoverstraining of the spring; in which the spring will be held inoperative position without the use of screws or other fastening members,and in which the spring may easily be replaced.

Other objects will be apparent from the following specification and fromthe accompanying drawings, in which- Figure 1 is a plan view of a wrenchembodying my invention, the said wrench being shown in engagement withtoothed wheels carried by the pressure-foot of a screw as used on veneerpresses. Fig. 2 is a fragmentary view of the operative end portion ofthe wrench, with one arm of the pawl cut away. Fig. 3 is an elevation ofthe combination shown in Fig. 1 and of a portion of the screw attachedto the pres sure-foot and ratchet.

The wrench of my invention is particularly suitable for use inmanipulating the pressure screws of veneer presses of the type shown inmy copending application, Serial No. 800,167, and is shown in thisconnection in Figs. 1 and 3 of the drawings. In veneer presses of thistype, the pressure is exerted by feet 1, each of which is supported by avertically disposed screw 2, which screw may be rapidly rotated bymanually grasping any one of a plurality of handles 3, which handles arerigid with respect to the screw. Secured to the screwshaft 2intermediate of the pressure-foot 1 and the said handles 3 are a pair oftoothed wheels 4 separated by a collar 5 of considerably smallerdiameter y than the toothed portions of the said wheels 4l. To rotate`the said screw-shaft by means of the toothed wheels 4, I provide awrench comprising a handle 6 equipped with a forked end 7 adapted tostraddle or slidingly t the said collar 5.

Secured to the handle 6 by a pivoted pin 8 are the arms9 of a pawlmember, which arms are disposed respectively upon opposite sides of thehandle of the wrench and are joined to a common head 10 presenting a tipportion adapted to engage the teeth of the wheels 1y after the usualmanner of ratchet pawls. The tip 10 of the pawl member preferablycorresponds in width approximately to the combined width of the twotoothed wheels 4c and the collar 5, the teeth of the said wheels 4:being in alinement so that the said tip of the pawl ,can simultaneouslyengage the teeth upon each of the said wheels.

The handlemember 6 is equipped near its forked end with a slot disposedat an angle to the axis of the handle 6, the opening of the said slotbeing directed toward the inner face of the pawl tip 10, which innerface preferably is so shaped as to afford a substantially right-angledformation, one of the face portions constituting the said formationhaving therein a recessed portion facing the said slot in the handle.Housed .by the said recessed portion of the tip of the pawl member isthe forward end 1l of a flat spring having a relatively long shank 12disposed substantially at right angles to its tip portion 11, the otherend of the said shank 12 being housed by the said slot in the handlemember.

It will be evident from Fig. 2 that the opening between the two arms orforks 9 of the pawl member will readily permit the forward end of thespring to be inserted in its normal position with respect to the pawlmember when the latter is detached from the handle 6 and that the rearend of the spring may readily be slipped into the said slot when thepawl member is being attached to the handle 6 by means of the pivot pin8, after which the said slot and the said formations upon the tipportion or head of the l to normally 'move the pawl to the positionshown in Fig. 2, thereby causing the tip of the pawl to interlock withthe adjacent alined teeth of the wheels t as shown in Fig.

c l. However, upon rotating the wrench in Fig. lin a clock-wisedirection, the inclined forward surface 13 of the nose of the pawl willride up the toothed head of the said alined teeth and over the latter,so as to enf gage vthe forward surface of the last-named teeth when thewrench is thereupon moved in the opposite direction.

'Io prevent a possible overstraining of the spring in case of a hastymanipulation of the wrench by an inexperienced user, I preferably equipthe handle 6 with stop formations 14: disposed upon opposite sidesthereof and respectively adapted vto engage the arms 9 of the pawlmember to limit the motion of the said pawl with respect to the handleof the wrench. However, I do not wish to be-limited to this or otherdetails of the construction herein disclosed, as it will be evident thatthe same might be modified in many ways without departing from thespirit of my invention.

I Vclaim as my invention:

l. -A wrench for a screw equipped with a pair of ratchet wheels rigidwith respect to the screw and separated by a shaft, comprising a handlemember having a forked end adapted to span the said shaft and equippednear its forkedend with a slot, a bifurcated pawl pivotally mounted onsaid handle member near the forked end thereof and equipped with aforward end portion extending substantially at right angles to thegeneral direction of the forks of the said pawl, said end portion havinga recess facing the pivot of the pawl; and a fiat spring equipped at oneend with a substantially right-angled formation housed within the angleformed by the said end portion and forks of the pawl, said recesspresenting a shoulder engaging the forward tip of said spring, the otherend of said spring housed by the said slot in the handle, whereby thesaid slot cooperates with said right-angled formation and said recess toretain the spring in operative position. 2. A wrench for a screwequipped with a pair of toothed wheels and a collar therebetween,comprising a handle having a bifurcated end straddling the said collar,the said handle equipped near its bifurcated end with a slot angularlydisposed with respect to the axis of the handle; a pawl member includinga pair of arms straddling a portion of said handle and jointly pivotedto the latter, and a tip extending substantially at right angles to thesaid arms and adapted to simultaneously engage teeth upon both of thesaid wheels, the said tip being substantially in alinement with the saidslot and equipped on the side facing the said slot with a recess; and aspring interposed between the handle and pawl, the opposite ends of saidspring slidably inserted respectively in said slot and said recess, anda pivotal connection between said handle and pawl, said pivotalconnection so disposed with respect to said spring that said slot andrecess will coact to maintain the spring in operative position.

In testimony whereof I have signed my name in presence of twosubscribing witnesses.

OSCAR BERGSTROM. Witnesses:

HERBERT H. JOSEPH, JOHN S. MILLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

